SVG object with same idrefs get conflicted even they are under different shadow root

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1486 matching lines @@
         if (!nameValue.isNull())
             updateName(nameValue, nullAtom);
     }
 
     ContainerNode::removedFrom(insertionPoint);
     if (wasInDocument) {
         if (this == document().cssTarget())
             document().setCSSTarget(nullptr);
 
         if (hasPendingResources())
-            document().accessSVGExtensions().removeElementFromPendingResources(this);
+            treeScope().accessSVGTreeScopedResources().removeElementFromPendingResources(this);
 
         if (getCustomElementState() == CustomElementState::Custom)
             CustomElement::enqueueDisconnectedCallback(this);
         else if (isUpgradedV0CustomElement())
             V0CustomElement::didDetach(this, insertionPoint->document());
 
         if (needsStyleInvalidation())
             document().styleEngine().styleInvalidator().clearInvalidation(*this);
     }
 
@@ skipping 2220 matching lines @@
 
 DEFINE_TRACE_WRAPPERS(Element)
 {
     if (hasRareData()) {
         visitor->traceWrappers(elementRareData());
     }
     ContainerNode::traceWrappers(visitor);
 }
 
 } // namespace blink